What is Heat? How does heat travel?

WHAT IS HEAT? HOW DOES HEAT TRAVEL?

Heat

When an Ice-cream dribbles down your hand, blame science. Heat  (Kinetic energy hidden inside things) moves around our world in very strict ways according to rules that cannot change.

Heat is a type of energy stored when atoms and molecules move around inside objects. Hotter objects contain more heat than colder ones because their atoms and molecules move faster. Heat doesn’t always stay in one place - if something hot is near something cold, it passes heat on until the two temperatures are equal. When the hot objects cool down, it loses a certain amount of energy to the cold one, which gains exactly the same energy and heats up.

How heat travels

Like other forms of energy, heat tends to spread out evenly. Hot abjects pass energy to colder ones nearby by three processes, called conduction, convection, and radiation. 

Often, more than one of the processes happens at the same time. A Radiator in your room might pass heat to the wall and floor by conduction (direct contact), convection (warm air currents), and radiation (beaming heat directly to your body).